Preventing Pitting In Aluminum Boats: Stop Corrosion In Its Tracks

how to stop pitting from continuing in aluminum boat

Pitting is a type of corrosion that occurs on aluminum boats, causing small holes to form in the metal. This is caused by a process called depassivation, which involves the deterioration of protective coatings around the metal due to contact with a chloride, such as saltwater. To stop pitting from continuing, it is important to clean the affected area, remove the corrosion, and then protect the surface.

1. Clean the aluminum surface by rinsing off dirt and grime using a power washer or hose.

2. Wash the surface with a mild alkaline soap, as common dish soap can have high alkaline levels that may strip the wax.

3. Dry the surface thoroughly with a microfiber towel.

4. Remove the corrosion using methods such as dry sanding, wet sanding, or a razor blade.

5. Buff the sanded area with a rotating buffer or fine steel wool until the surface is smooth and free of pitting.

6. Polish and protect the aluminum surface by applying an aluminum polish and sealer using a clean cloth.

7. Ensure proper maintenance by keeping the boat clean, dry, and well-ventilated.

8. Use an aluminum filler or putty to fill in deep pits that cannot be smoothed out.

9. Treat the affected area with an acid cleaner and a converter like Alodine to stop corrosion and create a protective barrier.

10. Apply a two-part epoxy paint or clear coat polyurethane to protect the converted aluminum surface.

11. Install zinc anodes to the boat to help protect the aluminum.

12. Avoid using treated lumber or plywood in contact with aluminum, as the chemicals can react and cause corrosion.

13. Ensure proper electrical grounding and bonding to prevent electrolysis, which can contribute to corrosion.

14. Use a barrier, such as plastic, between aluminum and other metals to prevent direct contact and reduce the risk of galvanic corrosion.

Characteristics	Values
Reason for pitting	Saltwater, galvanic corrosion, stray current, or crevice corrosion
Prevention	Keep the boat clean and dry, use a zinc anode, use a non-metal boat trailer, use a copper scrubber, use white vinegar, use a marine-grade sealant, use an acid cleaner, use a metal-free aluminium primer, use an organo tin paint, use a boat cover, use a battery disconnect
Repair	Rinse, sandblast, use a wire brush, use a burr bit, use an acid wash, use a sealant, use a marine epoxy, use a soldering iron, use a welding torch, use a polishing wheel, use a pressure washer, use a zinc duster, use a bottom paint, use a boat drain, use a bilge pump, use a hull repair kit, use a battery box, use a battery disconnect, use a zinc chromate paint, use a special aluminium primer, use a bed liner paint, use a bilge coating epoxy, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair kit, use a hull repair 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Wash, scrub, and sand the affected area

To stop pitting from continuing in an aluminum boat, it is important to wash, scrub, and sand the affected area. Here is a detailed guide on how to do this:

First, park your boat in a shady spot and place it on its trailer. Next, give your boat an initial wash by spraying down the aluminum surfaces to help loosen dirt and grime. Fill a bucket with water and add some car soap. Soak a sponge in the soapy water and scrub the boat. For problem areas that won't come clean, try using steel wool.

After the initial wash, it is time to apply an aluminum boat cleaning solution. Make sure to choose a product that is safe to use on boat hulls and read the instructions carefully before diluting the concentrate. Soak a scrubbing brush in the solution and scrub the aluminum surfaces, paying extra attention to any areas that were particularly dirty. Once you have scrubbed all the aluminum, check the instructions to see if the solution needs time to set or if you can rinse it off immediately.

If you want to remove deep pits, you can use either the dry or wet sanding method. For dry sanding, start with higher-grit sandpaper (200-400) and work your way to a finer grit (600-800). Use more abrasive sandpaper first to remove deep pits, and then switch to finer paper. Do two or three rounds of sanding, using a finer grit each round. For wet sanding, use sandpaper specifically for this method and start with a grit of around 200-400. Mix a bowl of water with a few drops of dishwashing liquid, wet the paper, and sand off the pitting. Finish with a fine grit of around 600-800.

After sanding, use a rotating buffer or fine steel wool to buff the sanded area until it appears smooth and free of pitting. Wipe off any debris with a clean microfiber towel.

Finally, polish and protect the aluminum surface by applying an aluminum polish and sealer using a clean cloth. This will not only brighten the surface but also defend it from further oxidation and pitting.

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Use an acid cleaner or etch and rinse

Pitting is a type of corrosion that occurs on aluminium boats due to a process called depassivation, which is caused by the deterioration of protective coatings around the metal when it comes into contact with a chloride. The main culprit for pitting on aluminium boats is salt water. To stop pitting from continuing, you can use an acid cleaner or etch and rinse the affected area. Here is a step-by-step guide on how to do this:

Step 1: Rinse and Wash the Aluminium Surface

Before applying any acid cleaner or etch, it is important to first rinse and wash the aluminium surface to remove any dirt, grime, or residue. You can use a power washer or a hose to blast away the dirt. After rinsing, wash the surface with a mild alkaline soap, as common dish soap may have high alkaline levels that can strip the wax off the surface. Once you're finished washing, thoroughly dry the surface with a microfiber towel.

Step 2: Apply an Acid Cleaner or Etch

There are a few different acid cleaners or etches that you can use to treat the corroded and pitted aluminium. One option is to use a phosphoric acid etch/brightener. Apply the phosphoric acid to the affected area and allow it to sit for a few minutes, working it in well with a Scotch-Brite pad. Another option is to use a metal clean and etch product, such as Krudd Kutter, which is specifically designed for aluminium. Follow the instructions on the product and make sure to wear the appropriate protective gear, such as gloves and eye protection.

Step 3: Rinse and Dry

After applying the acid cleaner or etch, thoroughly rinse the area with water. Make sure to rinse away all the residue and neutralise any remaining acid. Once rinsed, allow the aluminium surface to air dry completely.

Step 4: Apply a Protective Coating (Optional)

Once the aluminium is clean, dry, and free of corrosion, you may want to apply a protective coating to prevent future pitting and corrosion. You can apply a clear coat, primer, paint, or other protective coatings. If you choose to paint, make sure to use a metal etching primer for better adhesion.

Step 5: Maintain and Inspect Regularly

To prevent future pitting and corrosion, it is important to regularly clean and inspect your aluminium boat. Keep the boat clean, dry, and well-ventilated to prevent moisture buildup, which can lead to corrosion. Inspect the boat for any signs of corrosion or pitting, especially in areas that are difficult to access.

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Treat with Alodine

Treating your aluminium boat with Alodine is a great way to stop pitting corrosion in its tracks and prevent it from continuing. Alodine is a chromic acid solution that converts the aluminium surface to a non-corroding film, similar to anodizing. It is a standard process used in the aircraft industry to protect aluminium structures from corrosion.

Remove the boat from the trailer: You will need to get your boat off the trailer and place it on jacks or stands to access the underside of the hull.
Clean the affected areas: Use an acid cleaner or aluminium cleaner to thoroughly clean the areas with pitting corrosion. Make sure to wear gloves, goggles, and long sleeves during this process.
Rinse and dry: After cleaning, rinse the boat with water and allow it to dry completely.
Apply Alodine: Follow the instructions on the Alodine product you purchased and apply it to the cleaned and dried areas. Leave it on until the metal turns yellow. Do not leave it on for too long, or it may turn orange or brown.
Paint the treated areas: Once the Alodine has done its job, you will need to protect the treated areas by painting them. You can use a two-part epoxy paint or a clear coat of polyurethane. Make sure to follow the manufacturer's instructions for proper application.
Maintain your boat: To prevent future corrosion, make sure to keep your boat clean and dry. Regularly inspect for any signs of corrosion and treat them promptly. Consider using a product like ACF-50 or Corrosion Block to neutralize any corrosion cells and protect your boat.

Treating your aluminium boat with Alodine is a great way to stop pitting corrosion and ensure the longevity of your boat. By following these steps, you can effectively treat and protect your boat from further corrosion. Remember to always practice good boat maintenance and care to prevent future issues.

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Apply a primer

Applying a primer is an important step in protecting your aluminum boat from further corrosion. Here's a detailed guide on how to do it:

Step 1: Prepare the Surface

Before applying the primer, ensure that the aluminum surface is clean, dry, and free of any dirt, grease, or debris. Use a power washer or a hose to rinse off any dirt and grime. Then, wash the surface with a mild alkaline soap, as strong detergents can strip away any protective coatings. Avoid using common dish soap, as it often has high alkaline levels. Once you've finished washing, thoroughly dry the surface with a microfiber towel.

Step 2: Remove Corrosion and Pitting

Look for any signs of corrosion or pitting on the surface. You can use various methods to remove them, such as dry sanding, wet sanding, or using a razor blade. For dry and wet sanding, start with a higher grit sandpaper (200-400) and work your way to a finer grit (600-800). If you're using the wet sanding method, remember to use sandpaper specifically for wet sanding and mix a bowl of water with a few drops of dishwashing liquid. For deep pits, use more abrasive sandpaper first, then switch to finer paper. Finish by buffing the sanded area with a rotating buffer or fine steel wool until it's smooth and free of pitting.

Step 3: Choose the Right Primer

Select a primer specifically designed for aluminum surfaces. In the case of the boat owner in the provided text, they chose Interprotect 2000E, a top-of-the-line epoxy primer suitable for aluminum boats. Make sure to read and follow the manufacturer's instructions for the primer you choose.

Step 4: Apply the Primer

Consult the manufacturer's instructions for the correct application procedure and safety precautions. Typically, you'll need to mix the two parts of the primer and apply it with a brush, roller, or sprayer, depending on the product. Ensure you have adequate ventilation during the application process. Apply the primer in thin, even coats, following the recommended number of coats and drying time between each coat.

Step 5: Fill and Sand (Optional)

After applying a few coats of primer, you may notice some remaining corrosion spots or imperfections. You can fill these spots with an appropriate filler and then sand them down to create a smooth surface before applying additional primer coats.

Step 6: Finish with Topcoats

Once you've applied the specified number of primer coats and addressed any imperfections, you can finish the job with a topcoat of your choice, such as a paint or sealant designed for aluminum boats. Remember to follow the manufacturer's instructions for the topcoat application as well.

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Seal with epoxy or weld

Epoxy

Epoxy is a good option for sealing an aluminum boat and preventing further pitting. Epoxy bonds well with many materials, including most metals, and can be used to fill in any pits in the aluminum. Here are the steps to seal an aluminum boat with epoxy:

Clean the aluminum surface: Use a power washer or hose to rinse off dirt and grime. Wash the surface with a mild soap, avoiding dish soap, which may strip the wax. Dry the surface thoroughly with a microfiber towel.
Remove corrosion: This can be done through dry or wet sanding, or with a razor blade to scratch off the damaged areas.
Apply a seal coat of epoxy: Mix a small batch of epoxy resin and hardener, and apply it to the surface with a paintbrush. This will fill in any pores in the metal and create a strong bond. Allow the seal coat to cure for about four hours until it becomes tacky.
Apply a flood coat or deep pour coat: After the seal coat is partially cured, mix and pour a thicker coat of epoxy onto the surface. This will give a smooth, clear finish.
Remove any air bubbles: Use a heat gun or propane torch to remove air bubbles that may have formed during the pouring process. Be careful not to let the flame touch the epoxy, and keep the heat source moving constantly.

Welding

Welding is another option for sealing an aluminum boat and preventing further pitting. Welding aluminum boats requires more technical skill and specialized equipment than welding other materials. Here are the steps to weld an aluminum boat:

Prepare your tools and safety gear: You will need safety gear such as a welding helmet and leather gloves, as well as tools such as an angle grinder, brass brush, and a TIG or MIG welder.
Set up the machine: Consult a TIG settings chart for aluminum to set the correct tungsten and amperage settings. Set the welding machine to AC mode, which is required for TIG welding.
Clean the surface: Use the angle grinder and brass brush to remove any oxidation, dirt, and grime from the welding surface. It is important to do this immediately before starting the weld to prevent oxidation.
Start welding: Aluminum requires high heat to achieve a solid weld, so move quickly along the surface. Use a filler rod to add material at the welding point and prevent melting or warping the base metal.
Finish and polish the weld: Use a flap disc to clean up any sloppy welds or spatters, then switch to a Scotch wheel or sandpaper to smooth the surface. Finally, use a marine aluminum polish to blend the weld into the surrounding metal.

Comparison

Both epoxy and welding can effectively seal an aluminum boat and prevent further pitting. Epoxy is generally easier to work with and can be applied by hand, while welding requires more specialized equipment and technical skill. Epoxy may be a better option for filling in small pits and creating a smooth, clear finish, while welding can be used to join larger pieces of metal together. Ultimately, the best method will depend on the specific project and the level of expertise of the person performing the work.